diff --git a/opensearch/src/test/java/org/opensearch/sql/opensearch/storage/script/filter/lucene/MultiMatchTest.java b/opensearch/src/test/java/org/opensearch/sql/opensearch/storage/script/filter/lucene/MultiMatchTest.java
index 6023ff0f9e..fedc77432a 100644
--- a/opensearch/src/test/java/org/opensearch/sql/opensearch/storage/script/filter/lucene/MultiMatchTest.java
+++ b/opensearch/src/test/java/org/opensearch/sql/opensearch/storage/script/filter/lucene/MultiMatchTest.java
@@ -40,10 +40,10 @@ class MultiMatchTest {
       .dsl(new ExpressionConfig().functionRepository());
   private final MultiMatchQuery multiMatchQuery = new MultiMatchQuery();
   private final FunctionName multiMatchName = FunctionName.of("multimatch");
-  private final FunctionName multiMatchWithUnderscoreName = FunctionName.of("multi_match");
-  private final FunctionName multiMatchQueryName = FunctionName.of("multi_match");
+  private final FunctionName multi_matchName = FunctionName.of("multi_match");
+  private final FunctionName multiMatchQueryName = FunctionName.of("multimatchquery");
   private final FunctionName[] functionNames =
-      {multiMatchName, multiMatchWithUnderscoreName, multiMatchQueryName};
+      {multiMatchName, multi_matchName, multiMatchQueryName};
   private static final LiteralExpression fields_value = DSL.literal(
       new ExprTupleValue(new LinkedHashMap<>(ImmutableMap.of(
           "title", ExprValueUtils.floatValue(1.F),
diff --git a/sql/src/main/antlr/OpenSearchSQLParser.g4 b/sql/src/main/antlr/OpenSearchSQLParser.g4
index 910158566c..2761344474 100644
--- a/sql/src/main/antlr/OpenSearchSQLParser.g4
+++ b/sql/src/main/antlr/OpenSearchSQLParser.g4
@@ -348,7 +348,7 @@ multiFieldRelevanceFunction
         LT_SQR_PRTHS field=relevanceFieldAndWeight (COMMA field=relevanceFieldAndWeight)* RT_SQR_PRTHS
         COMMA query=relevanceQuery (COMMA relevanceArg)* RR_BRACKET
     | multiFieldRelevanceFunctionName LR_BRACKET
-              alternateMultiMatchQueryField  COMMA alternateMultiMatchQueryField
+              alternateMultiMatchQuery  COMMA alternateMultiMatchField
               (COMMA alternateMultiMatchOptionalArg)* RR_BRACKET
     ;
 
@@ -519,6 +519,12 @@ alternateMultiMatchOptionalArg
     | argName=stringLiteral EQUAL_SYMBOL argVal=relevanceArgValue
     ;
 
-alternateMultiMatchQueryField
+alternateMultiMatchQuery
     : argName=alternateMultiMatchArgName EQUAL_SYMBOL argVal=alternateMultiMatchArgVal
     ;
+
+alternateMultiMatchField
+    : argName=alternateMultiMatchArgName EQUAL_SYMBOL argVal=alternateMultiMatchArgVal
+    | argName=alternateMultiMatchArgName EQUAL_SYMBOL
+    LT_SQR_PRTHS argVal=alternateMultiMatchArgVal RT_SQR_PRTHS
+    ;
\ No newline at end of file
diff --git a/sql/src/main/java/org/opensearch/sql/sql/parser/AstExpressionBuilder.java b/sql/src/main/java/org/opensearch/sql/sql/parser/AstExpressionBuilder.java
index d6b7cdd398..c71c19e9de 100644
--- a/sql/src/main/java/org/opensearch/sql/sql/parser/AstExpressionBuilder.java
+++ b/sql/src/main/java/org/opensearch/sql/sql/parser/AstExpressionBuilder.java
@@ -409,7 +409,7 @@ public UnresolvedExpression visitMultiFieldRelevanceFunction(
             .equals(BuiltinFunctionName.MULTIMATCH.toString())
         || StringUtils.unquoteText(ctx.multiFieldRelevanceFunctionName().getText().toUpperCase())
             .equals(BuiltinFunctionName.MULTIMATCHQUERY.toString()))
-        && ! ctx.getRuleContexts(OpenSearchSQLParser.AlternateMultiMatchQueryFieldContext.class)
+        && ! ctx.getRuleContexts(OpenSearchSQLParser.AlternateMultiMatchQueryContext.class)
         .isEmpty()) {
       return new Function(
           ctx.multiFieldRelevanceFunctionName().getText().toLowerCase(),
@@ -516,32 +516,17 @@ private List<UnresolvedExpression> alternateMultiMatchArguments(
     // all the arguments are defaulted to string values
     // to skip environment resolving and function signature resolving
     ImmutableList.Builder<UnresolvedExpression> builder = ImmutableList.builder();
-    String fields = "";
-    String query = "";
-    for (var arg : ctx.getRuleContexts(
-        OpenSearchSQLParser.AlternateMultiMatchQueryFieldContext.class)) {
-      switch (StringUtils.unquoteText(arg.argName.getText())) {
-        case "query":
-          query = StringUtils.unquoteText(arg.argVal.getText());
-          break;
-
-        case "fields":
-          fields = StringUtils.unquoteText(arg.argVal.getText());
-          break;
-
-        default:
-          throw new SemanticCheckException(
-              String.format("can't resolve argument %s for %s",
-                  StringUtils.unquoteText(arg.argName.getText()),
-                  StringUtils.unquoteText(ctx.multiFieldRelevanceFunctionName().getText()))
-          );
-      }
-    }
+    ctx.getRuleContexts(OpenSearchSQLParser.AlternateMultiMatchFieldContext.class).stream().findFirst().ifPresent(
+        arg ->
+          builder.add(new UnresolvedArgument("fields",
+              new RelevanceFieldList(ImmutableMap.of(StringUtils.unquoteText(arg.argVal.getText()), 1F))))
+    );
 
-    builder.add(new UnresolvedArgument("fields",
-        new RelevanceFieldList(ImmutableMap.of(fields, 1F))));
-    builder.add(new UnresolvedArgument("query",
-        new Literal(query, DataType.STRING)));
+    ctx.getRuleContexts(OpenSearchSQLParser.AlternateMultiMatchQueryContext.class).stream().findFirst().ifPresent(
+        arg ->
+            builder.add(new UnresolvedArgument("query",
+                new Literal(StringUtils.unquoteText(arg.argVal.getText()), DataType.STRING)))
+    );
 
     // To support old syntax we must support argument keys as quoted strings.
     ctx.getRuleContexts(OpenSearchSQLParser.AlternateMultiMatchOptionalArgContext.class)